Internal combustion engine



4- J. c. BARNABY ET AL 1,968,982

INTERNAL COMBUSTION ENGINE s Sheets-Sheet 1 Filed March 13, 1931 JCBARNABY/u R .C.MATH EWSON.

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ATT RNEY Aug. 7, 1934. J. c. BARNABY ET AL INTERNAL COMBUSTION ENGINE Filed March 13. 1931 3 Sheets-Sheet 2 ////vvvv/v/vvvv/v// J.C.BARNABY -11 .RGMATHEWSON.

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A TOR/V5 Y 1934- J. c. BARNABY ET AL INTERNAL COMBUSTION ENGINE Filed March 15. 1931 Q a a 1N VENTORS.

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J-C.B ARNA av n v 11.1 $151 Wi 1 N .LTA 0 I %HH 1 2W6 j J/fi H" In Patented Aug. 7, 1934 I UNITED STATES PATENT OFFICE COMBUSTION ENGINE corporation of V l la Application March 13, 1931, Serial No. 522,192

Claims. (01. 184-6) This invention relates to internal combustion engines and more particularly toengines of the oil burning or Diesel type.

An object of the present invention is to pro- 5 vide a novel, unitary and simple cam assembly for Diesel or analogous internal combustion engines embodying a supporting bracket or a member, which carries the cam member, etc., forming a unitary structure, which may be readily attachedto or detached from the engine frame.

Another object of the present invention is to provide a novel, simple, inexpensive and efllcient method of lubricating the cam assembly of an internal combustion engine of this type, utilizing the engine frame and the cam assembly supporting bracket for forming a lubricant chamber from which the lubricant feeds to the various moving parts of the cam assembly.

with these and other objects in view, as may appear from the accompanying specification, the invention consists of variousv features of coni struction and combination of parts, which will be first described in connection-with the accompanying drawings, showing an. internal combustion engine of the preferred form embodying the invention, and the features forming the invention will be specifically pointed out in the claims.

Fig. 1 is a end elevation of an internal combustion engine embodying the present invention.

Fig. 2 is a vertical section.through the engine.

Fig.3 is a fragmentary vertical section through the engine takenon the line 3-3 of Fig. 2. 35 Fig. 4 is an enlarged fragmentary section. through the cam assembly and taken on the line 4-4 of Fig. 3, and

Fig. 5 is an enlarged fragmentary section through the cam assembly taken at right angles to the section shown in Fig. 4 and also taken on the line' 3-5 of Fig. 2 of the drawings.

Referring more particularly to the drawings, an internal combustion engine of the oil burning or Diesel type is illustrated in the drawings and this engine comprises the frame 1, which carries the cylinder 2 in which the piston 3 reciprocates. As in all internal combustion engines mof this type, spray or injection valves 4 are employed for injecting the fuel oil into the cylinders. The injection or spray valves 4 are operated by rocker arms 5, which are rocked at properly timed intervals and in proper sequence from the cam assembly lo through the medium of the push rods 8. The fuel is delivered at the proper intervals to the injection or spray valves 4 by the fuel pumps 7, which are of any approved type and these fuel pumps are also operated in proper timing and sequence from thecam assembly 10. i

The cam assembly 10- includes an attaching so bracket 11, which is attached to the outside of the frame 1 at one side thereof in any suitable manner such as by bolts 12. so as to permit its ready attachment to or detachment from the engine to facilitate replacement of parts or as repairs, as well as to facilitate and simplify its original manufacture and assembly.

The bracket 11 and the frame 1 have register-- ing recesses 13 and 14 respectively in their facing sides, which recesses combine to form a 70 lubricant chamber 17. The lubricant chamber 17 receives a supply of lubricating oil from the crank case of the engine through the usual oil supply pipe or line to the branch distributor 16. From the branch distributor 16, the lubri- 7s eating oilfor the chamber 1'7. passes through a pipe 18 indicated in dotted lines in Fig. 3 of the drawings. Thelubricating oil enters the chamber 17 at its bottom and at the end of the engine, on which the cam shaft and governor drive a are located. An overflow opening 19 is provided at the top of the chamber 17 and at the same end as the lubricating oil inlet to the chamber so that when the oil level in the chamber reaches the opening 19 any further oil delivered a to the chamber will overflow and return to the crankcase. v

A cam shaft 20 is provided, which is supported by suitable bearings 21, and which is connected to the crankshaft by a series of driving gears 22. 30 The cam shaft 20 has the various cams 23 thereon for operating the injection valve operatingrods 6, and the cams 24, for operating the fuel pumps 7. The bracket 11 is provided with ducts 25 at proper spaced intervals which communias cate with the chamber 17 and with the 21 for delivering lubricating oil to these bearings 21.

Each of the rods 6 has its lower end yieldably connected by means of a spring 26 to a plunger 1m 27, which is mounted for reciprocatory movement in a sleeve 28. covered by the bracket 11.

Each of the plungers 2'1 is held against rotary movement by a stop screw 29, which engages in a slot 30 in the plunger. Each of the plungers mg has depending brackets 31 thereon which carry pins 32 upon which the cam rollers 33 are mounted. The cam rollers 33 have engagement with the perimeter-s of the cams 23 and serve to reciprocate the plungers 2'! for moving the up rod 6 to rock the rocker arms 5 and operate the injection valves 4.

The bracket 11 has ducts 35 therein, which communicate with openings 36 in the sleeves 28 and permit lubricating oil to flow into the annular channels 37 formed in the plungers 27 for lubricating the moving surfaces of the plunger and the inner surfaces of the sleeve 28. The plungers 27 are provided with transverse passages 38 which open from the annular passages 37 into the axial bore 39, which alines with the cam rollers 33. The lubricating oil passing into the bore 39 passes downwardly at each side of the rollers 33 and into the cutaway portions 40 of the pins 32. The lubricating oil filling the cutaway portions 40 serves to lubricate the bearing surfaces of the pins 32 and rollers 33.

The mechanism for operating the fuel pumps 7 is similar to the mechanism for operating the rods 6 and fuel injection valves 4 in that the fuel pumps push rods 41 are connected to plungers 42 which reciprocate in sleeves 43 carried by the bracket 11. The plungers 42 have cam roller carrying pins 44 carried thereby on which are mounted cam rollers 45. The cam rollers 45 engage the perimeters of the cams 24 for reciprocating the plungers 42 at the proper timed intervals for operating fuel pumps. The plungers 42 are provided with annular lubricant receiving ducts which have communication with the chamber 17 through suitable openings 47 in the bracket 11. The lubricating oil passes from the annular ducts 46 through the transverse openings 48 into the bore 49 and from the bore 49 into the flat portion 50 of the pins 44 for lubricating the bearing surfaces of the pins 44 and cam rollers 45.

From the foregoing description taken in connection with the accompanying drawings, it will be apparent that a simple and practical cam assembly has been provided, which is carried by a single bracket attached to the exterior of the frame of the engine in such manner that it may be easily attached to or detached from the engine, that it may be manufactured and assembled in a unit and afterwards, attached to the engine and also that the bracket has been utilized in a simple, novel, efficient and practical manner for lubricating all of the moving parts of the cam assembly.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown but that they may be widely modified within the invention defined by the claims.

What is claimed is:-

I. In an internal combustion engine, a frame, a cam assembly supporting bracket attached to said frame, said bracket provided with a lubricant chamber, operating plungers carried by said bracket, said bracket provided with ducts communicating with said chamber to lubricate said plungers, supporting pins carried by said plungers provided with.lubricant receiving cutaway portions, said plungers provided with passages to permit lubricant to flow into the cutaway portions of said pins.

2. In an internal combustion engine, a frame,

a cam assembly supporting bracket attached to said frame, fuel pumps carried by said bracket and including push rods, sleeves carried by said bracket, plungers reciprocably mounted in said sleeves, cam rollers carried by said plungers, a cam shaft carried by said frame, cams on said shaft and engaging said rollers for reciprocating said plungers, said push rods being adjustably connected to said plungers, said bracket being provided with a lubricant recess, said sleeve and plunger provided with registering ducts communicating with said lubricating chamber, and means to prevent rotary movement of said plungers.

3. In an internal combustion engine, a frame, a cam assembly supporting bracket attached to said frame, fuel pumps carried by said bracket and including push rods, sleeves carried by said bracket, plungers reciprocably mounted in said sleeves, cam rollers carried by said plungers, a cam shaft carried by said frame, cams on said shaft and engaging said rollers for reciprocating said: plungers, said push rods being adjustably connected to said plungers, said bracket being provided with a lubricant recess, said sleeve and plunger provided with registering ducts communicating with said lubricating chamber, said plungers provided with longitudinal grooves, and means engaging in said grooves to permit longitudinal movement of said plungers and prevent rotary movement thereof.

4. In an internal combustion engine, a frame, a cam assembly supporting bracket attached to said frame, fuel pumps carried by said bracket and including push rods, sleeves carried by said bracket, plungers reciprocably mounted in said sleeves, cam rollers carried by said plungers, a cam shaft carried by said frame, cams on said shaft and engaging said rollers for reciprocating said plungers, said push rods being adjustably connected to said plungers, said bracket being provided with a lubricant recess, said sleeve and plunger provided with registering ducts communicating with said lubricating chamber, said engine including a crankcase, a branch distributor for delivering lubricant from the crankcase to said lubricant chamber, said chamber provided with an overflow outlet for permitting lubricant above a predetermined quantity to return to said crankcase.

5. In an internal combustion engine, a frame, a cam assembly supporting bracket attached to said frame, fuel pumps carried by said bracket and including push rods, sleeves carried by said bracket, plungers reciprocably mounted in said sleeves, supporting pins carried by said plungers,. cam rollers on said supporting pins, said bracket being provided with a lubricant recess, said sleeve and plunger provided with registering ducts communicating with said lubricant chamber, said pins provided with lubricant receiving cut-away portions, said plungers provided with passages to permit lubricant to flow into the cut-away portions of said pins.

JAMES C. BARNABY. ROBERT C. MATHEWSON. 

